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Electric Traction

Electric Traction
If the coefficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails?

0.35
0.16
0.26
0.46

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Electric Traction
The value of coefficient of adhesion will be high when rails are

Cleaned with sand
Sprayed with oil
Greased
Wet

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Electric Traction
The friction at the track is proportional to

1/speed
1/(speed)²
Speed
None of the listed here

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Electric Traction
The resistance encountered by a train in motion is on account of

All of the listed here
Resistance offered by air
Friction at the track
Friction at various parts of the rolling stock

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Electric Traction
Specific energy consumption becomes

More on steeper gradient
All of the listed here
Less if distance between stops is more
More with high train resistance

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Electric Traction
In main line service as compared to urban and suburban service

Acceleration and retardation rates are low
All of the listed here
Distance between the stops is more
Maximum speed reached is high

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